Acid-Base Nature of Hydroxides
According to Gallis if the electronegativity of an element, let\’s say: A in a hydroxide (AOH) is more than 1.7 then it will be acidic in nature whereas it will be basic in nature if electronegativity is less than 1.7.
If the value is more than 
, then that hydroxide will be basic otherwise it will be acidic.
The Polarity of covalent bond ∝ Difference of electronegativities
Note: More electronegative N is written first in NH3 because it became very common from the very beginning. There is no scientific basis for that. Otherwise, according to the rule, it should have been written as H3N in the form of trihydrogen nitride.
Acidic and Basic Nature of Hydroxides of Elements
Acidic and basic nature of hydroxide of an element, let\’s say A in AOH depends on ionization potential of the element A. If ionization potential of A is low then it will give its electron to oxygen easily thus AOH will be basic.
Basic Character of Elements
Acidic Character of Elements
Acid-Base Nature of Oxides
The classification of elements as metals and non-metals impacts the acid-base nature of the elements. Generally, oxides of metals are basic in nature whereas oxides of nonmetals are acidic in nature.
